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A180432 Start with 3. If a, b in sequence, so is ab+1. 0

%I

%S 3,10,31,94,101,283,304,311,850,913,934,941,962,1011,2551,2740,2803,

%T 2824,2831,2887,2915,3034,3041,3111,3132,7654,8221,8410,8473,8494,

%U 8501,8662,8746,8774,8837,9103,9124,9131,9334,9341,9397,9411,9425,9495,9621

%N Start with 3. If a, b in sequence, so is ab+1.

%C The difference between any two terms is == 0 (mod 7).

%t f[s_List] := Select[ Union@ Join[s, Union[1 + Times @@@ Subsets[ Join[s, s], {2}]]], # < 10000 &]; Nest[f, {3}, 8]

%Y Cf. A009293.

%K nonn

%O 1,1

%A _Robert G. Wilson v_, Sep 04 2010

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Last modified September 25 18:27 EDT 2022. Contains 356986 sequences. (Running on oeis4.)